JPH04281428A - Liquid crystal display element and its manufacture - Google Patents

Abstract

PURPOSE:To offer the liquid crystal display element which is reliable by marking the generation of gas in a liquid crystal cell hard and increasing the strength of the liquid crystal display element. CONSTITUTION:In the liquid display element equipped with the liquid crystal cell 10 which uses plastic film substrates 11 and 12 and a polarizing plate 21 stuck on the liquid crystal cell 10, the polarizing plate 21 is provided with proximity parts 22 and 23 nearby sealing holes 14 and 15 of the liquid crystal cell 10 so that the sealing holes 14 and 15 are surrounded and also equipped with a flexible reinforcement member 30 at the periphery of the sealing hole 14 surrounded with the proximity parts 22 and 23.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device using a plastic film substrate and a method for manufacturing the same.

0002

[Prior Art] Conventionally, in a liquid crystal display element using a plastic film substrate, when a polarizing plate is attached to the liquid crystal cell, the vicinity of the filling opening of the liquid crystal cell protrudes from the display surface due to the sealant. As shown in FIGS. 3 and 4, the polarizing plate 5 was attached to the liquid crystal cell 4 at a distance from the filling ports 4a and 4b. Furthermore, the protrusion of the sealant 6 from the display surface 4c is necessary in order to ensure sealing of the sealing port, since the sealing performance of the liquid crystal cell 4 greatly affects the performance of the liquid crystal display element. It has become. In addition, in the figure, 1 is the upper substrate,
2 is a lower substrate, and 3 is a sealing member for bonding and sealing the peripheral portions of both substrates 1 and 2.

0003

[Problems to be Solved by the Invention] However, in such conventional liquid crystal display elements, a polarizing plate is not attached near the filling opening of the liquid crystal cell and the plastic film substrate is exposed, so that the polarizing plate is not attached. Although the polarizing plate serves as a gas barrier layer in the exposed portions of the plastic film substrate, air bubbles tend to form inside the liquid crystal cell in the exposed portions of the plastic film substrate due to the gas permeability of the substrate. Furthermore, since the strength of the liquid crystal display element differs between the part where the polarizing plate is pasted and the part where the polarizing plate is not pasted, there is a problem in that the boundary part is particularly susceptible to damage. Therefore, the reliability of the liquid crystal display element was low.

The present invention has been made in view of the above-mentioned problems in the prior art.The present invention is designed to make it difficult for gas to occur in a liquid crystal cell by devising the shape of a polarizing plate, and to improve the strength of a liquid crystal display element. The purpose is to provide a highly reliable liquid crystal display element.

[0005]

[Means for Solving the Problem] A liquid crystal display element according to the invention as claimed in claim 1 is a liquid crystal display element comprising a liquid crystal cell using a plastic film substrate and a polarizing plate attached to the liquid crystal cell. , characterized in that the polarizing plate is provided with a proximal portion adjacent to the filling port so as to surround the filling port of the liquid crystal cell, and a flexible covering reinforcing member is provided around the filling port surrounded by the proximal portion. .

[0006] Furthermore, in the method for manufacturing a liquid crystal display element according to the invention as set forth in claim 2, a predetermined material dissolved in a solvent is dropped around the filling port surrounded by the proximal portion, and then the area around the filling port is dried. It is characterized by forming a flexible covered reinforcing member.

[0007]

[Function] In the invention as claimed in claim 1, a polarizing plate is provided with a proximal portion close to the filling port so as to surround the filling port of the liquid crystal cell, and a flexible coating is reinforced around the filling port surrounded by the proximal portion. A member is provided. Therefore, the plastic film substrate is not exposed as it is, and gas is less likely to be generated within the liquid crystal cell. Furthermore, since the polarizing plate is provided even near the filling port, the strength of the liquid crystal display element is increased, resulting in a highly reliable liquid crystal display element.

In the invention as set forth in claim 2, a predetermined material dissolved in a solvent is dropped around the enclosing port surrounded by the adjacent portion, and the area around the enclosing port is dried to form a flexible covering reinforcing member. . Therefore, when providing the covering reinforcing member around the filling port, unnecessary force is not applied to the liquid crystal cell.
Reliability is further improved.

[0009]

EXAMPLES The present invention will be explained below based on examples. 1 and 2 are diagrams showing an embodiment of a liquid crystal display element according to the invention as claimed in claim 1. FIG. 1 is a plan view of the liquid crystal display element as seen from the display surface side, and FIG. It is a sectional view taken along the line A-A.

In FIGS. 1 and 2, reference numeral 10 denotes a liquid crystal cell, and the liquid crystal cells 10 each include an upper substrate 1 which faces each other with a predetermined gap therebetween and has a predetermined pattern of transparent electrodes on the opposing surfaces thereof.
1 and a lower substrate 12 (plastic film substrate), and a sealing member 13 that adheres and seals the peripheral parts of both substrates 11 and 12. This liquid crystal cell 10 has a filling opening 1 that penetrates one end of the upper substrate 11 in the thickness direction.
4 and 15 are formed, and the sealing ports 14 and 15 are sealed with a sealant 16. Upper substrate 11 and lower substrate 1
For example, uniaxially stretched PET (polyethylene terephthalate) is used as the material of 2, and by sealing the liquid crystal L inside such a liquid crystal cell 10, a 240° screw thread is formed between the upper and lower substrates 11 and 12. STN
(Super Twisted Nematic) structure cells are configured.

Reference numeral 21 denotes one polarizing plate attached to the display surface side of the liquid crystal cell 10, and this polarizing plate 21 has an inlet 14, a
Proximal portions 22, 23 are provided adjacent to 15. Enclosure ports 14 and 1 surrounded by adjacent portions 22 and 23 of polarizing plate 21
The peripheral area of the substrate 11 has gas barrier properties and
, 12 and the polarizing plate 21, the covering reinforcement member 3 is more flexible than the polarizing plate 21.
0 is set.

Next, an embodiment of the method for manufacturing a liquid crystal display element according to the invention as claimed in claim 2, that is, the covering reinforcing member 30
The formation method will be explained. When forming this covered reinforcing member 30, first, the adjacent portions 22 and 23 of the polarizing plate 21 are
A predetermined material, such as polyvinylidene chloride (other materials may be, for example, polyvinyl alcohol, polyamide, epoxy resin, acrylate, urethane resin, or polyethylene), is placed around the sealing ports 14 and 15 surrounded by tetrahydrofuran. Dissolve it in a solvent such as
and the adjacent parts 22, 23 of the polarizing plate 21), and then the surroundings of the sealing ports 14, 15 covered with the dropping agent are dried to form a flexible member. Alternatively, if polyvinyl alcohol is used as the material for the covering reinforcing member 30, it will have excellent gas barrier properties and high productivity. In this case, for example, dissolve polyvinyl alcohol in water and use a dispenser to apply the sealant 16 and the adjacent portion 2 of the polarizing plate 21.
The coating reinforcing member 30 can be formed by dropping the mixture between 2 and 23 and heating it at, for example, 80° C. for about 3 hours.

Note that a polarizing plate (the other polarizing plate) with a reflection plate (not shown) is attached to the back side of the liquid crystal cell 10. Regarding the liquid crystal display element of this example,
As a result of conducting a reliability test for 1000 hours at a temperature of 40° C. and a humidity of 90%, no bubbles were generated. That is, in this embodiment, by providing the proximal parts 22 and 23 on the polarizing plate 21, the gas barrier by the polarizing plate 21 is made wider, and the filling ports 14 and 1 surrounded by the proximal parts 22 and 23
By providing the flexible covering reinforcing member 30 around the periphery of the liquid crystal cell 5, the plastic film substrates 11 and 12 are not exposed as they are, and gas is less likely to be generated within the liquid crystal cell 10. Furthermore, since the polarizing plate 21 is provided near the filling ports 14 and 15, the strength of the liquid crystal display element is increased, resulting in a highly reliable liquid crystal display element. Further, since the covering reinforcing member 30 can reinforce the vicinity of the filling ports 14 and 15 of the liquid crystal cell 10, the impact resistance is also improved compared to the case where the covering reinforcing member 30 is not provided.

[0014]

According to the invention as set forth in claim 1, the polarizing plate is provided with a proximal portion adjacent to the filling port so as to surround the filling port of the liquid crystal cell, and the vicinity of the filling port surrounded by the proximal portion is provided with flexibility. Since a certain covering reinforcing member is provided, it is possible to prevent the plastic film substrate from being exposed as it is, making it difficult for gas to occur in the liquid crystal cell, and further increasing the strength of the liquid crystal display element. . As a result, a highly reliable liquid crystal display element can be provided.

According to the second aspect of the invention, a predetermined material is dissolved in a solvent and dropped around the enclosing port surrounded by the adjacent portion, and the area around the enclosing port is dried to form a flexible covering reinforcing member. Therefore, when providing the covering reinforcing member around the sealing port, it is possible to prevent unnecessary force from being applied to the liquid crystal cell, and reliability can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a liquid crystal display element according to a first aspect of the invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a plan view showing a conventional liquid crystal display element.

FIG. 4 is a sectional view taken along the line BB in FIG. 3;

[Explanation of symbols]

10 Liquid crystal cell 11 Upper substrate (plastic film substrate) 12
Lower substrate (plastic film substrate) 14, 1
5 Enclosure port 21 Polarizing plates 22, 23 Proximity portion 30 Covering reinforcing member

Claims (2)

[Claims] 1. A liquid crystal display element comprising a liquid crystal cell using a plastic film substrate and a polarizing plate attached to the liquid crystal cell, wherein the polarizing plate has a liquid crystal cell with a liquid crystal cell having a liquid crystal cell. In addition to providing a proximate portion,
A liquid crystal display element characterized in that a flexible covering reinforcing member is provided around the filling port surrounded by the adjacent portion. 2. The method for manufacturing a liquid crystal display element according to claim 1, wherein a predetermined material is dissolved in a solvent and dropped around the filling port surrounded by the adjacent portion, and then the area around the filling port is dried. A method for manufacturing a liquid crystal display device, comprising: forming a flexible covering reinforcing member.